Aspects of the present invention relate to a wastewater treatment process (100) and a wastewater treatment plant (1) for treating wastewater. The wastewater treatment process (100) comprises receiving wastewater for treatment. The wastewater is supplied to a bioreactor (13) for performing biological filtration of the wastewater. The wastewater is discharged from the bioreactor (13) to a mechanical filter apparatus (15) disposed downstream of the bioreactor (13). The mechanical filter apparatus (15) comprises a static filter pack (75) for filtering solid waste suspended in the wastewater. The static filter pack (75) comprises a plurality of mechanical filter elements (71) each having one or more filter cells (73). The treated wastewater is discharged.